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Derivative Financial Instruments and Hedging Activities - Summary of Changes in Notional Balances of Holdings of Derivatives (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value $ 4,552 $ 5,429
IRLCs [Member]    
Derivative Notional Balance [Roll Forward]    
Notional Amount, beginning balance 96,339  
Additions 1,288,938  
Assumed in connection with the acquisition of PHH 50,731  
Amortization 0  
Maturities (1,014,466)  
Terminations (271,367)  
Notional Amount, ending balance 150,175 96,339
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value [1] 3,871 3,283
Gains (losses) on derivatives 3,809 (3,089)
Forward Mortgage Backed Securities Trades [Member]    
Derivative Notional Balance [Roll Forward]    
Notional Amount, beginning balance 240,823  
Additions 404,162  
Assumed in connection with the acquisition of PHH 0  
Amortization 0  
Maturities (479,622)  
Terminations 0  
Notional Amount, ending balance 165,363 240,823
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value [1] (4,983) (545)
Gains (losses) on derivatives 136 (8,529)
Interest Rate Cap [Member]    
Derivative Notional Balance [Roll Forward]    
Notional Amount, beginning balance 375,000  
Additions 173,750  
Assumed in connection with the acquisition of PHH 0  
Amortization (288,750)  
Maturities 0  
Terminations 0  
Notional Amount, ending balance 260,000 375,000
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value [1] 678 2,056
Gains (losses) on derivatives $ (841) $ 10
[1] Derivatives are reported at fair value in Other assets or in Other liabilities on our consolidated balance sheets.